Now head on to Golden Hills - Stronghold. Send the blues to turn the wheel on the right (#1) and go across the bridge. Kill the dwarves inside and turn left - on the platform you'll find a sack of gold - take it and watch out for the guy with bombs. Kill the rest of the dwarves and loot the room. In the back, by the entrance, behind your back, a dwarf with fireblaster will come out so erase him. Take the stairs opposite the entrance and then up to the top (#2).
Follow the path and you'll come to another stairs which will lead you to another path leading to the entrance (#1). Wait a second, there's another fireblasting dwarf coming! and more dwarves behind him. Lure them to the side and then take care of the one with fireblaster. Now go to Royal Halls. Be careful - the first room (#2) is full of bombs and more guys with fireblasters!
Now take the strategy: send one minion at a time to the bombs downstairs to start them, leave them to blow the pillars and come back to you so the pillars will fall over to the dwarves. Remember that even when they're out of energy it takes a while for them to explode. When you're done with them, a few more will come with crossbows. The best way to get rid of them is with the bombs too. Then enter the gate there (#1). Good news: to the left from the entrance there's a chamber full of gold and treasure. Take them now if you want cause you won't have time later. Go past spawning pits, a blood pit and the waypoint (#2) - use them if you need and enter the next room.
Here you'll see Goldo - you've heard about him before. Basically, he'll play similar game like Sir William meaning: he'll run away from you. But - he'll come back driving a machine-monster (#1). You can send some minions to lure him and hit the machine yourself from the back (#2) - it won't hurt you. When it looses more-less half of the energy you'll see a scene after which you'll be able to finish the battle. When Goldo eventually jumps off his car - come and give him your final shot. Then go to the next room, watch the next scene and... oh! the place is going to collapse! - save the elves and go back to your tower.